Ultrasonic Pulse Velocity in Concrete Using Direct and Indirect Transmission

Abstract

The relationship between velocities of ultrasonic stress waves trans mitted along direcr and indirect paths was investigated. Tests were conducted on plain concrete slabs of dimensions 1000 x 1500 mm, with a thickness of 250 mm. Direct ulrrasonic wave transmission tests were conducted between rop and bOltom su/faces of the slabs and indirect tests were conducted along the slab sUlface. A test pro cedure, described in BS 1881 to determine indirect wave velocities, was refined by defining the number and spacing of transducers. Comparisons were made between direct and indirect wave velocity measurements using staristical analysis. The statistical analysis revealed thar direct and indirect wave velocities could be used interchangeably in evaluating the properties of the concrete. The minimum number oftest poil1ls requiredfor a reliable estimate ofindi rect wave velocity was studied and recommendations are provided.

Utilizing wave propagation techniques to determine the influences of the type and size of coarse aggregates on the elastic properties of concrete

“…The deformations within the concrete measured with embedded strain gauges are 50% higher than those obtained by strain gauges attached to the external surfaces of the specimen (Klink, 1975). Ultrasonic measurements are internal, which can explain why the Poisson ratios obtained by ultrasonic testing in this research and in other studies (Yaman et al, 2001;Gonçalves et al, 2011;Beniwal; are higher than those proposed by the ABNT (ABNT NBR 6118, 2023).…”

Framework for assessing bridge quality index based on the correlation of non-destructive test results

“…The pulse velocity test follows the principle that the density, homogeneity, and static modulus of elasticity of the material passing through it determine the pulse's ability to travel through any medium (Yaman et al, 2001) [ 22 ]. The guidelines provided in Table 2 can be used to evaluate the uniformity of concrete quality (Indian Standards, 1992) [ 23 ].…”

“… S·N. Static Modulus of elasticity (E c ) Gpa Quality grading 1 0.83Ed (Yaman et al, 2001) [ 22 ] 2 1.25Ed-19 (Standard, n.d.) [ 29 ] 3 1.04Ed - 4.1 (Standard, n.d.) [ 29 ] 4 (Popovics et al, 2008) [ 30 ] …”